An arithmetic sequence begins as follows:

Give the first integer in the sequence.

How many integers in the following infinite series are positive: 100, 91, 82, 73 . . . ?

Find the term of the sequence above.

In a sequence of numbers, each term is times larger than the one before it. If the 3rd term of the sequence is 12, and the 6th term is 96, what is the sum of all of the terms less than 250?

Which of the following are not natural numbers?

I. 1

II. 0

III. 349010

IV. -2

V. 1/4